. Essentials of botany. Botany; Botany. THE FUNGI 253 on account of their economic importance. Forms differ- ing enormously in general appearance, size, and life habits are included in this class. Here belong two genera of large, edible fungi, the morel (Figs. 176, 177) and the truffle. Many injurious genera are found, some of them saprophytes and others parasites. Best known among the former are the green and the yellow molds, more properly called mildews (Fig. 175). A few ex- amples of the latter are the grape- vine mildew, the black-knot fungus of plum and cherry trees, the peach-curl fungu
. Essentials of botany. Botany; Botany. THE FUNGI 253 on account of their economic importance. Forms differ- ing enormously in general appearance, size, and life habits are included in this class. Here belong two genera of large, edible fungi, the morel (Figs. 176, 177) and the truffle. Many injurious genera are found, some of them saprophytes and others parasites. Best known among the former are the green and the yellow molds, more properly called mildews (Fig. 175). A few ex- amples of the latter are the grape- vine mildew, the black-knot fungus of plum and cherry trees, the peach-curl fungus, the bitter rot of apples, the brown rot of peaches, and the plum pocket fungus. LICHENS, SAC FUNGI AS MESS- MATES WITH ALG^ 327. Definition, Occurrence. — Lichens (Figs. 178,179) were formerly supposed to be a dis- tinct class of plants, and it is less than forty years since their real nature began to be understood. A lichen is a combination of two plants. The green cells, called the gonidia (Fig. 180, g), be- long to some species of alga, and the remainder, the larger portion of the growth, is a fungus (usually a sac fungus) parasitic upon that alga. The groups of lichens correspond in structure to certain groups of fungi, but the genera are. Firx. 177. A Vertical Section of the Spore-Bearing Surface of Fig. 176. (x240.) a, asci, or spore-sacs; m, myce- lium; p, paraphyses, or sterile Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Bergen, Joseph Y. (Joseph Young), 1851-1917. Boston, Ginn
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